Controlling mechanism for carburetors



Nov. 9 1926.

. L. W. MELCHER CONTROLLING MECHANISM FOR GARBURETORS Filed Sept. 171923 O wim@ Patented Nov. 9v, 1926. i

Unirsesra'rEsj LEE W. MELCHER, E WEST DE PERE, WISCONSIN, AssIeNoEvToEterna/tav I/IoToEs CORPORATION, OP DE PERE, WISCONSIN-,A CORPORATIONoEWIsCoNsIN. i

CONTEOIQLING MECHANISM EOEl CAEBUEETOEsf Appiication filed september 17,1923. `serial Nassau?.

The invention relates to controlling mechanism for carburetors used Withinternal combustion engines and its object is to provide improvedcontrolling devices which are adapted to control the Vcarburetor from aremote point, such as the" cab of amotordriven railroad car.Anotherobject of the invention is to provide improved controllingdevices which are adapted for very minute adjustments, so that when aplurality of motors are used on a single car, they will beaccuratelycontrolled to attain the desired synchronism between themotors. Other objects of the invention will appear from thespecification.

rlhe invention consists in the several novel features hereinafter setforth and more par ticularly defined by claims at the conclusion hereof.l

In the drawings: Fig. 1 is a plan of a motor providedvWith theinvention. Fig. 2 is a side elevation. Fig.` 3 is a horizontal sectionthrough the controlling devices. Y The invention is exemplified inconnection with a motor comprising cylinders 5in any desired number andaround which is formed the usual Water jacket 6 for cooling the motor.The motor is provided With the usual Water circulating system, such as apump 9, which receives, through the pipe 10, Water from a radiator(notshown) and forces it through a pipe 11 into the Waterjacket aroundthe motor r cylinder and through a discharge manifold 8 into theradiator. Since these parts may be of the usual construction, it has notbeen deemed necessary to illustrate them indetail'. The pumpand itsconnections serve to circulate Water through the Water-jacket around thecylinders, and the pump is, as usual, driven by the motor... The latteris mounted on sills 12 which are supported by frame-bars 13 Whicharesuitably secured to the car. Combustible fluid is 'delivered from acarburet-or 15 through the usual pipe and manir fold Which is connectedin the usual manner to deliver the Huid by suction into the motorcylinders, as Well understood in the art. The carburetor is providedwith the usual throttle-valve 14 for regulating the flow of combustiblefluid to the cylinders and correspondingly controlling the speed of themotor. The shaft 16, on which this throttle is mounted, is provided Withan arm 17 Which is operable by the controlling mechanism hereinafter setforth to regulate andvary .the speed of the motor.

` The improved controlling mechanism for the carburetor comprises aregulator', which is vadapted to be operated responsively to thepressure of the coolingliquid in the Water jacket',"a1id an air operateddevice, controllalble at V'Will to operate the throttle valve, subjectto the variations'in' pressure .in the cooling liquid; A Vlever 20,lWhich is.`centrally pivoted at 22 to the fixed frame-bar 21, and to oneendof this lever is connected at 24,'a rod 28, which has its otherl endpivotally connected to the throttle arm 17. The other end s pivoted to astem 25 which is adapted to' be operated by a diaphragm'26 which has itsmargin confined between the sections ofv avcasing 27 .j An air pipe 28is connected to deliver air into one side of the casing Ato operate thediaphragm in one direction. yPipe 28 is connected to deliver compressedvair under control of an operator-s valve from a suitable source of 'airsupply, such as an air tank carried by the car and kept automaticallyfilled by the motor, as exemplified in an application iiled by me March5, 1923, Serial No. 622,7 51. A valve 29 exemplifies one which islocated atany controllingstation and whereby the operator may "cause airunder pressure to flow into the diaphragm casing 27 to operate diaphragm26 and the controller lever 20, the ext-ent of movement of the leverdepending upon the pressure of the air 'admitted to the casing 27. Thediaphragmpperated stem 25 is slidably mounted in a plug 37, Which isthreaded into one section of dia` phragm casing 27. This casingissupported by a fixed bar 38 which is clamped betiveen a shoulder of theplug 37 and one kend of the'casing 27. A spring 30,.coiled around a rod31`Which has one of its ends pivoted,V as at 32, to lever 20, isinterposed betweenframe-bar 21 and an adjustable nut 33, Which isscreivfthreaded to rod 31." This springservesy to'normally hold thelever 20 vinposition to close the throttle, and by adjusting the nut 33,the resistance of the spring to the movement of the lever may be 1varied Within the desired degrees.

The regulator, which is responsive to the fiucutations of pressure inthe Water-jacket, comprises a diaphragm 34: which has its margin securedin a casing 35 whch is `formed of sections. One side of said casing iscontese side of the casing 35'and said stem isl pivoted, as at 42, tothe controller lever 20, Head 40 is adapted-to be operated in onedirection by diaphragm 34, so that the pressure of the fluid in thewater jacket and against said diaphragm will constitute a resilientresistance which is automatically variedby thepressure of the coolingliquid to automatically control, in conjunction with the pressureagainst diaphragm 26, the operation of lever 20 to control the throttle14. Lever 2O is guided in a loop 44 which is fixedto frame-bar 21 and anadjustable-screw 45 is secured inthe outer end of said loop to limit theoutward movement of the inner end of'tlie'lever. A valve 47 is includedin pipe 36 between the water-diaphragm and the water jacket, so that thewater-operatedV regulator may be rendered inoperative if desired.

In operation, the pressure against diaphragm 34 is variable and inaccordance with the speed of the motor, since this varying pressure isgenerated through the circulating pump which is driven by the motor. Theoperator will control the throttle through valve 29 by which compressedair will be delivered against one side of' the diaphragm 26 which willcause -it to operate stem 25 and lever 20' against the force of spring3() and also against the force. of the water pressure against diaphragm34, The operation of the lever 20 by the compressed air will sh-ift rod23 to correspond-v ingly open the throttle 14 which controls the supplyof combustible fluid to the motor cylinders. Assuming air of a givenpressure to have been admitted to the casing of diaphragm 26, to operatethe throttle for a given speed of the motor, any fluctuations in thespeed of the motor will cause corresponding variation in the pressure ofwater against the diaphragm 34 to automatically regulate the position oflever 2() so as to operate the lever 2O to partially close the throttlein degree correspondingl to the pressure variation of the water inthewater-jacke't. Thev pressure of air` against the diaphragm 26, whichis variable, atfthe Vwillof the opera-tor through valve V29,l regulatesthe speed of the motor generally. The variation of the water pressureagainst diaphragm 34 exerts the ground pressure to lever 2O which isvariable according to the variation in the speed of the motor andconsequently th-e controlling mechanism is adapted to provide a veryminute adjustment by which the desired speed may be maintained and whichis of advantage in instances where it is desired to" synchronize theoperation of a plurality of motors.

TheV invention exemplifies improved controlling mechanism for aninternal combustion motor which is adapted to be controlled .from aremote point and in which the varying pressure of the cooling liquid .inthe water-jacket is used in regulating the speed rot the motor undercontrol of the air-operated diaphragm which is controllable at the willof the operator. rlhe purpose of providing an adjustable spring pressurefor the lever 20 is to permita plurality of motors toibo identicallyadjusted to operate atthe same speeds, notwithstanding a variableraction in the governor, due to friction or otherwise.

rlhe invention is not to be understood as restricted to details setforth, since the-se may be modified within the scope of the appendedclaims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent, is: I

1. The combination with a water-jaclreted motor, of a throttle forcontrollingA the supply of fuel thereto, and mea-ns for controlling t-hethrottle comprising a lever connected to said throttle, a fluidregulator connected to said lever and responsive to Huctuations ofpressure in the Water-jacket, a device operable by compressed` air andconnected to shift the lever to open said throttle, and an adjustablespring tension device connected to and adapted to retract said lever.

2. The combination with a water-jacleted motor, of a throttle forcontrolling the supply of fuel thereto, and means for controlling thethrottle comprising a lever connected to said throttle, a fluidregulator con- :nectedV to said lever and responsive to fluctuationsY ofpressure in the water-jacket, a diaphragm operable by compressed air andconnectedto shift the lever to open said throttle, and adjustable springmeans connected to and adapted to retract said lever.

Signed at Green Bay, iVis., this 5th day of September, 1923. l

LEE W. MELCHER.'

